Perpendicular Lines are a pair of lines that always intersect each other at right angles . Learn the properties, formula and examples of Perpendicular Lines in this article. Perpendicular lines are two lines that intersect each other at an angle of 90°. We can also say that, if two lines are perpendicular , their intersection forms a right angle. Here, we will learn more details of the perpendicular lines . We will learn about its properties and solve some exercises. Free perpendicular lines math topic guide, including it's definition, step-by-step examples, free practice questions, and more! Perpendicular lines are an essential concept in math and geometry. Find out everything you need to know with Brighterly.